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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83b8f4fe4e82b4d69e5cd1e5bc71c69dfaca3b0d23a2e4f1b78893507b30431' 
  AND token = 'YD/m+Q5X3T8APrrpdDef8hfZAyozyznvI1KuW2TgQDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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