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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0dcd89146c66ca02babbdaa5bd4c30868b596932493f7eb2d06b394d268236' 
  AND token = 'xLNHxJQycYqir6pGgJ6dipZf5+D9Ur2nXhBgDNmgGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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