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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6c1bf1603089d26619faff1129ba7ccceb6f430cc3bd8d18e0ca0729018b1d' 
  AND token = 'EizKepWQ9Dnzmm97oBSSPN5jHN+YVWnTHqBYd+RDO80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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