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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b47e6beea7ef7cd6f1027492058194a00cfa3e062ef4bdbfa6d2d9497c62ec' 
  AND token = '+mmWj3wRz6kMsAGK7zR4ukTOeh7qlV8mc+ANotIJuLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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