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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfd07a4a8bf2f6c1a6ce4a0ae1b2307c97c32e2ef69641bb47d4fc299d428ff' 
  AND token = 'a5zX5/ANwsguEZsOKH7CJMY+ZLtJkkuwydL8u2iNigs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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