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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93cf0c08a014ef544c659f10d41844c2fd8706a7c5db20e6075208b387a66d9' 
  AND token = 'lcGzRIFCGMFuQThExq+6AjDJ71yTFnUVcyLuByDNQoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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