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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4893d7fa4c3ae51103a85003e112a511cb6d367a1a191b6daf63406299abd5c1' 
  AND token = 'Mn0c/13R4SlFfwT7MF39s9FhOObqPKn+UKqg2j1dfhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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