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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5f5772c745f5589f2c63ac2c1c3254fb777bbc7f4b7c40fbaa4436fc2cca20' 
  AND token = '/4iFEpC+w4p8+aYAo1im3xYPiY8zRlE2KHtkPP5AkXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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