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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b62ccfc7eda52234cbe73ef9ad9007466feadca35f837bddda223b4302604ac' 
  AND token = 'x5uosC9wR4kJgGSrNxOPcRLK9HrHcKPYOKoTN6JuT5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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