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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4633b4fdcd3c0112426e363284c9fb9c9bdc53299c01c33dcb7867a967d0c4ec' 
  AND token = 'X9EhB4cmfeAZ+IPpxdgrOiD2+Rk8JxyUihcG2+Pl+Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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