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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f563dfff339656f325cbc24b5969a5558bd961715785c4ad08041800b055bf9' 
  AND token = '4Z1eK56XzMncP6WTZvvXs/JtckCywA+c33SbIgpCiT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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