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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40ca8c981c187444c4d26e16cd59cb301f9af43ebb7bee9344f6485cfb58d3c' 
  AND token = 'xevWQNECDWxcTLJ9VmZPpzqOgC9m9O+FS9/tz3gfcf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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