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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb2f76ffb8722063ac2cc68ada28283a20179530a6ea815ab590658313da5af' 
  AND token = 'OQdfRLzZmSCLx7X4g6oOB0jr7edJRA4gZDchaziOmbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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