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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6eb22e294c354bd0f9d14eb52cb546f2fcfd04eaa2acaa785446a9e2cbeaf74' 
  AND token = '/tSL+Jan3nwWncG25N2ZYOFaEVHHuI2ItHX5xJM8hok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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