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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2c3fd1bee57ee0a837e737db6befc4da07dccf893826e70f5fc6193c86aef8' 
  AND token = 'xw/Bt/klJxMtlB56HSuNU0WBQEmLLAzLMhxmqhGAZKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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