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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca3ca14bcaf2490d95621b15a32320d6b6506a3df1108eb8a2dc421b9e65651' 
  AND token = '9bhZQxwbnCE+ttsduFMXE7bUdLKHYT1YC+Bb+K/u5lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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