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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ccbe100065933f5d0260599349ca799401506bc84a0b3c9080e7899727af10' 
  AND token = 'wf7FX/7S3zFeFLYqN5cBHnvtRCjIzZkWjw/7mlG8MsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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