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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0530414d2e208f440a13646a1e200b77a392fcb1a0f95baee7dcc38baed10f' 
  AND token = 'iUoWpH6Dchjig9Z7A8LGurUVbjCd94ovpdP9mT5naWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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