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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1342d9bd7b2f7b4d63d25bdbfccdedb166575d2bd5053812d8ee1691d4a7a97e' 
  AND token = 'vYulxRkNIwxT9364VJTvUuHszzfYFEvEAWtKRvnJIGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}