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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b70bd4e63dc0d03f44b2f61a84736dde1c1d3553c9a206416bbb01ca5dced84' 
  AND token = 'PpBB3gbtec1o/vJaqYCdYB69XXKL6DV5v/WHzWXje14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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