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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff30ddbf832c6cd41aa8ad9a0c654d90157afca8e0492f35d4ed8f931d36ce2b' 
  AND token = 'TjllL5SZLPsILfc8NsROLsVj2bTbKz649iG9x3ZEJ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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