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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5bfa4035707fcc7275674a8eab68a7c15f11727cc7c682d58293338df61c1f' 
  AND token = 'jMDKyB32a1RGK6Z+lVJoxXZxacIlM1BS1HPT8peWfi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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