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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd156b3921ff8cf3bf0ba7ec0c4b067db4090ecb0a63245783997398bc4ce6599' 
  AND token = 'x0rQhgYn/tt/L0V1J/SjC5hBB8byhVwUEdPKofeTkwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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