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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24993e745ca1590c7d337e5b741ad49870ac51981d4a29557c65add937c487b0' 
  AND token = 'f8JsV87aA2S0GsHyXgftBrY8iFNEfapqzP5J2ZekZms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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