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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a61047c60965efaf0e428ed224bdbfec9a1fdfec5d01e3c1ae7096d7e1d88a' 
  AND token = 'c4/Q0e2RPzzH9BJfY51Cg0jpCY/+bPn7yLhby4XtdwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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