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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f0ec5132244e8403d254a651772fb5adf4c437b8eb358ae95902a513f1c5fa' 
  AND token = 'FzCTh9hHTGXNlU1SnbGZIpoy2TfAOjfBjJTwmsjMiFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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