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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dbe5aca2fb9f5567ed2b06a1157155161028eec8efa2c895ecce1af6e88bdc' 
  AND token = 'W9bqQETPAR9NKHlovztZ0lf9+uvku0rkR8G0OJg5pVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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