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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c189064b76104c79aea560afa40791bc3830922bf643be60e6b6c71726254c0' 
  AND token = '682HpD0BZN+IjltHysO6v9NG6/LPiVtyhZrbhoSjI8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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