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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2b99b6af7752cc19e6ab96c25f7cac2aa547ac8b20fa8b8d3c797345328637' 
  AND token = 'kpF9wph/25xnDBG7+KKBYFkcO95s47jZu/fIKaiQIKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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