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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f0f8b8f7a8a7b3ce4e389b1e02eed4cff04dce0e1119e9a0dabe9fb1306337' 
  AND token = '9vGJ7lUFj7/iXB+tLLYDeQDDgY6fmBRWCdZJCeOLfbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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