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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653882cc887d1a610902c757e4340b0c381289ae1fd1e8f07eb295bdc1512a54' 
  AND token = 'KsUpBCkofFZL1TaSfn17mao1MH+oWZeBZ9l7IPEG9ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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