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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d952de446840c1aca206d212b4e18e88efb937dbcd6d17f81febea11182d35' 
  AND token = 'pqdYnA4SAVX7NyZwzy57kZD28nzJ5758gRz0iX8ZcHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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