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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d5a9f4777cfa5728729817cee8bed0f6c93aa91a832660a533e479ee074282' 
  AND token = 'a3SSXThrZEG7fpp0Nmyk61ISOfMxyTtiYfyHJ8LZSmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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