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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c038e73ac3aa351402e1f8677795a94d1d7d677b8b12bcb92ae18574f4cc4287' 
  AND token = 'NlA3gkvoxhJe2Y9YBKQTmhWrQ0INcvkPMo93xgYgzYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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