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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584865fc7d9aad92c23ef9d8aa682de60d805d7317f36ab8fcda1331f5f954de' 
  AND token = 'K/7w+lntrm+10ekZ9yoVWawho1z/epS9BeXHmI8p4/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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