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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084b40d6c29efdffec0d4aa7e52d435ae906eab1501c844a28a7f553b467e909' 
  AND token = 'n5pLoBUqvvJXxtWNtAoVUarB/R5c5sRXXXuULszuL10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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