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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777e95283b01770563bf4cd4e2f9fa1ed360661e43aa086d0b521ac7bdfeeda9' 
  AND token = 'YJj6RkBXmJV7Rev4bEjGFbQmYN5jjUr8m8poRylDkj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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