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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd9e145960e0950b34af39f5ffb694caf8dc1b1d7ae2155fc29eaa72fd27c7d' 
  AND token = 'fIpTnWYnJtM/dwNKfREVlCQKpMfQsRD0QKXXHAelmVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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