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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46db8baa5ff1ea517e071fc4e0cc0c210fa689fb047e8a23404927aedbc303c9' 
  AND token = 'P3aXqCHTGlmhlfWJZ859/15wsaVOuDTOc5MMqrA3ZE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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