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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71564c68abfb0dfbfc52a9d1318ddba7d2500b68055af1fbd7e6f58cda0ea3f' 
  AND token = 'dPO1w6hmf4DhSFVasQLrIwrEHb7aOhqzeOy9YlmO9c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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