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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0703855bfb32e91cc6c4a32c17f78a7f4b83825fdddf6f1c4f799cba63de04' 
  AND token = '357GT3AuS6ChtJwYUHd8IuHMreeyMakX6k8qAGcX6r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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