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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9b90778672cf99b665ed17899bf12825779e37a353e62850860913a4e6fe6e' 
  AND token = 'RSAfszBWMtCV1FuxyE7Ery0ZWG/WbwxZK8pyi2H4F1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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