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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0c5747a23ac0acb248f78c339ef833df4644098bd57b3bfc228e20b85f4c7e' 
  AND token = 'dlJ36o5YuZHp43W8YzL7/b6xdmpF+CFSPHwKUDKHZOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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