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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea89cd6c1a0449559968c32fe826cc6bfe1e1b6f7c7535eecf9aab08c4799d83' 
  AND token = '4ZnbLw7cpUY3xUXHJCOvInVcu/lycy3TFRG6pgQUA/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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