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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04dcc188e0ee4a9ec169b21c75dea0f9c32c31aac2d87a8bb6a5b1ebf6ff459' 
  AND token = 'V6tlsUsYJvJNggtBNxzZAIRbUtVcqRQ/jW73JZgiapI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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