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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f857452bb134a1feb76884acd50ad4362150a5261b79a870611c02059ab6b9d7' 
  AND token = '1ZrgWcjPPj0BdWfDPVoO2YWxxg7AwVK7y8/7At4TxoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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