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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c431045ccb0ce1b6be2f1f02b2ea7c3b5470634cd2cd7bd0966d68e954aad0a' 
  AND token = '1CDK8vHWDXRMhO35JN2SxcYD7asvwzys6MUv34d7UFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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