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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71799161f239e09cff50690aab1ae99b8e19f3eae732408486d04df40c6eb10' 
  AND token = 'SQWisv5NyeliUJOVrad+l+/k7NwogPmuS/aLnL6EvY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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