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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e13dbbf0573a327e184e60faf9f1b0bd6eb7dc6f3234386b5c3d92251927f6' 
  AND token = 'Z0xQgOR6Wd7JopcTZPG9+qQsCy0jWP72sidPil5Q820=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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