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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d47390e968c4f4f9706e21bd16208b1e52eabce18e453afb28312ab539c42c1' 
  AND token = '0V+DGqtSbRq/nqcq874SOds8kSnQvKvmA+RdStdVITw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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