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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af21fb42416cd4959b0c06bbe2548eb053fb8dc941c416f48be04472cf8f72dc' 
  AND token = 'RfIq3R81+jNolHPz0kpT4pORVhlf5J1pMSLOwA0sY9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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