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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08265a00d24865158c45a18d142fb010fc571860df8f2202ff9e3c8eecdeb7bc' 
  AND token = 'bV9UKB4mdteOxDx5IAjN8Kcw4pN453wTGWDeUyVkKYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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