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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e75a2649b3fbe9bfac42b0e236ae0893589d42ef694c1f7bcff30efe0e739b' 
  AND token = 'OYUC13FYEoB2NQjqTqM5JznCORO1lnFJCxa4W7ncza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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