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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e420e3df623b6e7ea64a4ea3138dac24e169fc98f633e9323394783f5b8bf7' 
  AND token = 'fI8no7YMCrH4rfifXpWA5QGIpwOixejf9lIRglboqtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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