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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402422f6cfd667885b4a4138c93f420885ca97499e2b86f01e1b71b622273fdc' 
  AND token = 'nODhsK0Bz6l27PnPp8sX1aqoP/8McrgKeLvS+4c9c7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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