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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653a0a5c4709f8065a7253bcf2ce97f56ac4402f7ffaa05684a75c87a644abd7' 
  AND token = 'g9Pw6REgElSGNjzSkgOX8Hu4slMx4ZEk80o/EdpFm0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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