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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5dd1e11f3d73a2a54c15b15c004d5b0e6c77e74002c7c18fe5e511d78022c6' 
  AND token = 'bY7K0eBuN74aZZIcUI0UtYA+X/xMdn+WyH/WJCjDfLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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