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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bda167bc1bbe98b55c14cb3de24e5a252eaef36a911f0ca2e910f421924296' 
  AND token = '56CUa+W+4Ra2BAEVA0safW6WjcvN9O6w/moq/KV7OpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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