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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01a9e4b2efd8a13c0713179f14a9d3dde482e8520c17f1abe0be7f8974c3f62' 
  AND token = 'ZGL/Pv/TaHQo9s7rhn+JNIxjyL275bSeU2yTxK1Fd5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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