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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec7e4717b7dd77e6c3ef0d92088fd9da3877d79ca80b1209269b7a42ab6f338' 
  AND token = 'JlmFeoMHtbFp/+0Ojy5dbKpOof/sOcJzijdId967atw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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