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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e365f74c70849f38cd3f93bc8246a7472ac632a69f80f9d1ae4edafa23c0cee' 
  AND token = 'PJ586pOkMjD2EdTTLTe7zpJpHwhjU0Cj9RihnTonHPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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