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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3bd6eacc0ed5a11fa102794c98d7d3abed2523d31f5305cb055f8b49f84f72' 
  AND token = 'AmKYodAkVK3Z3Sl4FXKsNcncoyG/kZK/4zwCF/25H0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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